To understand the concept of WAS hosting, we need to comprehend how a system is configured and how a service contract is created, enabling different binding to the hosted service.

First of all, enable WCF for non-protocols. Before we start creating the service, we need to configure the system to support WAS. Following are the steps to configure WAS −

• Click Start Menu → Control Panel → Programs and Features, and click “Turn Windows Components On or Off” in the left pane.

• Expand “Microsoft .Net Framework 3.0” and enable “Windows Communication Foundation HTTP Activation” and “Windows Communication Foundation Non- HTTP Activation”.

• Next, we need to add Binding to the default website. As an example, we will bind the default website to the TCP protocol. Go to Start Menu → Programs → Accessories. Right click on the “Command Prompt”, and select “Run as administrator” from the context menu.

• Execute the following command −

C:Windowssystem32inetsrv> appcmd.exe set site "Default Web Site" -+bindings.[protocol=''net.tcp'',bindingInformation=''808:*'']

This command adds the net.tcp site binding to the default website by modifying the applicationHost.config file located in the “C:Windowssystem32inetsrvconfig” directory. Similarly, we can add different protocols to the default website.

Create WAS Hosted Service

Step-1 − Open Visual Studio 2008 and click New → WebSite and select WCF Service from the template and Location as HTTP, as shown below −

Step-2 − Create the Contract by creating an interface IMathService. Add the ServiceContract attribute to the interface and the OperationContract attribute to the method declaration.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

// NOTE: You can use the "Rename" command on the "Refactor" menu to 
// change the interface name "IService" in both code and config file 
// together.

[ServiceContract]

Public interface IMathService {
   [OperationContract]
   int Add(int num1, int num2);

   [OperationContract]
   int Subtract(int num1, int num2);
} 

Step-3 − The implementation of the IMathService interface is shown below −

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

// NOTE: You can use the "Rename" command on the "Refactor" menu to 
// change the class name "Service" in code, svc and config file 
// together.

Public class MathService : IMathService {
   Public int Add(int num1, int num2) {
      return num1 + num2;
   }
   Public int Subtract(int num1, int num2) {
      return num1 - num2;
   }
}

Step-4 − The Service file is shown below.

<%@ServiceHostLanguage="C#"Debug="true"Service="MathService"CodeBehind="~/App_Code/MathService.cs"%>

Step-5 − In the web.Config file, create endpoint with ”netTcpBinding” binding and the service metadata will be published using the Metadata Exchange point. So create the Metadata Exchange end-point with the address as ”mex” and the binding as ”mexTcpBinding”. Without publishing the service metadata, we cannot create the proxy using the net.tcp address, for example −

svcutil.exe net.tcp://localhost/WASHostedService/MathService.svc).

<?xml version = "1.0" ?>
<configuration>
   <!--
      Note: As an alternative to hand editing this file you can use the 
         web admin tool to configure settings for your application. Use
         the Website->Asp.Net Configuration option in Visual Studio.
         A full list of settings and comments can be found in 
         machine.config.comments usually located in 
         WindowsMicrosoft.NetFrameworkvx.xConfig 
   -->
   <configSections>
      <sectionGroup name = "system.web.extensions" 
         type = "System.Web.Configuration.SystemWebExtensionsSectionGroup, 
         System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
         PublicKeyToken = 31BF3856AD364E35">
		
         <sectionGroup name = "scripting" 
            type = "System.Web.Configuration.ScriptingSectionGroup, 
            System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken =3 1BF3856AD364E35">

            <section name = "scriptResourceHandler" 
               type = "System.Web.Configuration.ScriptingScriptResourceHandlerSection, 
               System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
               PublicKeyToken = 31BF3856AD364E35" 
               requirePermission = "false" 
               allowDefinition = "MachineToApplication"/>

            <sectionGroup name = "webServices" 
               type = "System.Web.Configuration.ScriptingWebServicesSectionGroup, 
               System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
               PublicKeyToken = 31BF3856AD364E35">

               <section name = "jsonSerialization" 
                  type = "System.Web.Configuration.ScriptingJsonSerializationSection, 
                  System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
                  PublicKeyToken = 31BF3856AD364E35" requirePermission = "false" 
                  allowDefinition = "Everywhere"/>

               <section name = "profileService" 		     
                  type = "System.Web.Configuration.ScriptingProfileServiceSection, 
                  System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
                  PublicKeyToken = 31BF3856AD364E35" requirePermission = "false" 
                  allowDefinition = "MachineToApplication"/>

               <section name = "authenticationService" 			     
                  type = "System.Web.Configuration.ScriptingAuthenticationServiceSection, 
                  System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
                  PublicKeyToken = 31BF3856AD364E35" requirePermission = "false" 
                  allowDefinition = "MachineToApplication"/>

               <section name = "roleService"	
                  type = "System.Web.Configuration.ScriptingRoleServiceSection, 
                  System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
                  PublicKeyToken = 31BF3856AD364E35" requirePermission = "false"
                  allowDefinition = "MachineToApplication"/>

            </sectionGroup>
         </sectionGroup>
      </sectionGroup>
   </configSections>
   
   <appSettings/>
   <connectionStrings/>
   
   <system.web>
      <!--
         Set compilation debug="true" to insert debugging 
         symbols into the compiled page. Because this 
         affects performance, set this value to true only 
         during development.
      -->
      <compilation debug = "true">
         <assemblies>
            <add assembly = "System.Core, Version = 3.5.0.0, 
               Culture = neutral, PublicKeyToken = B77A5C561934E089"/>
            
            <add assembly = "System.Web.Extensions, Version = 3.5.0.0, 
               Culture = neutral, PublicKeyToken = 31BF3856AD364E35"/>
            
            <add assembly = "System.Data.DataSetExtensions, 
               Version = 3.5.0.0, Culture = neutral,                  
               PublicKeyToken = B77A5C561934E089"/>
            
            <add assembly = "System.Web.Extensions, Version = 3.5.0.0, 
               Culture = neutral, PublicKeyToken = 31BF3856AD364E35"/>
            
            <add assembly = "System.Xml.Linq, 
               Version = 3.5.0.0, Culture = neutral, 
               PublicKeyToken = B77A5C561934E089"/>
         </assemblies>
      </compilation>
      
      <!--
         The <authentication> section enables configuration          
         of the security authentication mode used by 
         ASP.NET to identify an incoming user. 
      -->
      
      <authentication mode="Windows"/>
      
      <!--
         The <customErrors> section enables configuration 
         of what to do if/when an unhandled error occurs 
         during the execution of a request. Specifically, 
         it enables developers to configure html error pages 
         to be displayed in place of a error stack trace.
         <customErrors mode = "RemoteOnly" defaultRedirect = "GenericErrorPage.htm">
         <error statusCode = "403" redirect = "NoAccess.htm" />
         <error statusCode = "404" redirect = "FileNotFound.htm" />
         </customErrors>
      -->
      
      <pages>
         <controls>
            <add tagPrefix = "asp" namespace = "System.Web.UI" 
               assembly = "System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
               PublicKeyToken = 31BF3856AD364E35"/>
            
            <add tagPrefix = "asp" namespace = "System.Web.UI.WebControls"
               assembly = "System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
               PublicKeyToken = 31BF3856AD364E35"/>
         </controls>
      </pages>
      
      <httpHandlers>
         <remove verb = "*" path = "*.asmx"/>
         
         <add verb =" *" path =" *.asmx" validate="false"         
            type = "System.Web.Script.Services.ScriptHandlerFactory, 
            System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
         
         <add verb = "*" path = "*_AppService.axd" validate = "false" 
            type = "System.Web.Script.Services.ScriptHandlerFactory,System.Web.Extensions, 
            Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
         
         <add verb = "GET,HEAD" path = "ScriptResource.axd"        
            type = "System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, 
            Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35" validate = "false"/>
      </httpHandlers>
      
      <httpModules>
         <add name = "ScriptModule" 
            type = "System.Web.Handlers.ScriptModule, 
            System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
      </httpModules>
      
   </system.web>
   
   <system.codedom>
      <compilers>
         
         <compiler language = "c#;cs;csharp" extension = ".cs" warningLevel = "4" 
            type = "Microsoft.CSharp.CSharpCodeProvider, System, 
            Version = 2.0.0.0, Culture = neutral,                 
            PublicKeyToken = b77a5c561934e089">
         
            <providerOption name = "CompilerVersion" value = "v3.5"/>
            <providerOption name = "WarnAsError" value = "false"/>
         </compiler>
         
         <compiler language = "vb;vbs;visualbasic;vbscript" 
            extension = ".vb" warningLevel = "4" 
            type = "Microsoft.VisualBasic.VBCodeProvider, System, 
            Version = 2.0.0.0, Culture = neutral,                  
            PublicKeyToken = b77a5c561934e089">
         
            <providerOption name = "CompilerVersion" value = "v3.5"/>
            <providerOption name = "OptionInfer" value = "true"/>
            <providerOption name = "WarnAsError" value = "false"/>
         </compiler>
      
      </compilers>
   </system.codedom>
   
   <!--
      The system.webServer section is required for running ASP.NET AJAX under 
      Internet Information Services 7.0. It is not necessary for previous version of IIS.
   -->
   
   <system.webServer>
      <validation validateIntegratedModeConfiguration = "false"/>
      
      <modules>
         <remove name = "ScriptModule"/>
         <add name = "ScriptModule" preCondition = "managedHandler"         
            type = "System.Web.Handlers.ScriptModule, System.Web.Extensions, 
            Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
      </modules>
      
      <handlers>
         <remove name = "WebServiceHandlerFactory-Integrated"/>
         <remove name = "ScriptHandlerFactory"/>
         <remove name = "ScriptHandlerFactoryAppServices"/>
         <remove name = "ScriptResource"/>
         
         <add name = "ScriptHandlerFactory" 
            verb = "*" path = "*.asmx" preCondition = "integratedMode"              
            type = "System.Web.Script.Services.ScriptHandlerFactory, 
            System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
         
         <add name = "ScriptHandlerFactoryAppServices" 
            verb = "*" path = "*_AppService.axd" preCondition = "integratedMode" 
            type = "System.Web.Script.Services.ScriptHandlerFactory, 
            System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
         
         <add name = "ScriptResource" preCondition = "integratedMode" 
            verb = "GET,HEAD" path = "ScriptResource.axd" 
            type = "System.Web.Handlers.ScriptResourceHandler, 
            System.Web.Extensions, Version = 3.5.0.0, Culture = neutral, 
            PublicKeyToken = 31BF3856AD364E35"/>
         
      </handlers>
      <!--
         To browse web app root directory during debugging, set the value below to true. 
         Set to false before deployment to avoid disclosing web app folder information.
      -->
      <directoryBrowse enabled="true"/>
   </system.webServer>
   
   <runtime>
      <assemblyBinding appliesTo = "v2.0.05727" xmlns = "urn:schemas-microsoft-com:asm.v1">
      
         <dependentAssembly>
            <assemblyIdentity name = "System.Web.Extensions" publicKeyToken = "31bf3856ad364e35"/>
            <bindingRedirect oldVersion = "1.0.0.0-1.1.0.0" newVersion = "3.5.0.0"/>
         </dependentAssembly>
         
         <dependentAssembly>
            <assemblyIdentity name = "System.Web.Extensions.Design" publicKeyToken = "31bf3856ad364e35"/>
            <bindingRedirect oldVersion = "1.0.0.0-1.1.0.0" newVersion = "3.5.0.0"/>
         </dependentAssembly>
         
      </assemblyBinding>
   </runtime>
   
   <system.serviceModel>
      <services>
         <service behaviorConfiguration = "ServiceBehavior" name = "Service">
            <endpoint address = "" binding = "basicHttpBinding" contract = "IMathService">
            
            <identity>
               <dns value = "localhost" />
            </identity>
            
            </endpoint>
            <endpoint address = "mex" binding = "mexHttpBinding" contract = "IMetadataExchange"/>
         </service>
      </services>
      
      <behaviors>
         <serviceBehaviors>
            <behavior name = "ServiceBehavior">
               <!-- 
                  To avoid disclosing metadata information, set the value below 
                  to false before deployment. 
               -->
               <serviceMetadata httpGetEnabled="true"/>
               
               <!-- 
                  To receive exception details in faults for debugging purposes, 
                  set the value below to true. Set to false before deployment to avoid 
                  disclosing exception information 
               -->
               <serviceDebug includeExceptionDetailInFaults="false"/>
            </behavior>
         </serviceBehaviors>
      </behaviors>
      
   </system.serviceModel>
</configuration>

Enable Different Bindings to the Hosted Service

• Go to Start menu → Programs → Accessories. Right click on the “Command Prompt”, and select “Run as administrator” from the context menu.

• Execute the following command –

C:Windowssystem32inetsrv>appcmd set app "Default Web Site/WASHostedService" /enabledProtocols:http,net.tcp

It will produce the following output −